Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
  • C08F220/36—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate
  • C08F220/365—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate containing oxygen in addition to the carboxy oxygen, e.g. 2-N-morpholinoethyl (meth)acrylate or 2-isocyanatoethyl (meth)acrylate containing further carboxylic moieties
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
  • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

Definitions

• the present invention relates to a polymer for a photo-alignment film, a polymer solution, a photo-alignment film, an optical anisotropic body, and a liquid crystal display element.
• the photo-alignment film has excellent characteristics that there is no micro-scratching due to mechanical rubbing, there is no risk of dust generation due to rubbing and the accompanying destruction of TFT elements, and high-definition patterning is possible. For this reason, the application to various liquid crystal displays is energetically advanced. In particular, there is a great demand for a photo-alignment film for horizontal alignment (planar alignment) used for an IPS / FFS display.
• a method for producing a photo-alignment film that is not subjected to rubbing treatment first, a solution containing a photo-alignment polymer is applied on a substrate to form a dried film, and then the liquid crystal is irradiated with polarized light.
• a method of imparting an alignment regulating force to the surface of the photo-alignment film is generally used (see, for example, Patent Document 1).
• AC image sticking means that liquid crystal molecules do not completely return to the alignment direction defined by the photo-alignment film even if the voltage is applied to the liquid crystal molecules and then the voltage is not applied. It is a failure mode that causes it. When AC image sticking occurs, the contrast is seriously lowered. Therefore, a photo-alignment film that hardly causes AC image sticking is desired.
• the present invention has been made in view of the above circumstances, and a polymer for a photo-alignment film capable of forming a photo-alignment film having an excellent alignment regulating force, a photo-alignment film formed by the polymer for a photo-alignment film, It is an object to provide an optical anisotropic body having a photo-alignment film and a liquid crystal display element.
• the first aspect of the present invention is the general formula (X)
• R 11 is a group represented by the general formula (QX)
• a broken line represents a bond
• Saa is at least one selected from the group consisting of a single bond, an alkylene group having 1 to 3 carbon atoms, —O—, —COO—, and —O—CO—).
• Va represents at least one group selected from the group consisting of alkyl groups having 1 to 7 carbon atoms, alkyl ether groups, naphthyl groups and anthryl groups, wherein Saa is the alkylene group;
• Va is the alkyl group, the total number of carbon atoms that Saa and Va have is 7 or less,
• One of the —CH 2 — groups constituting the alkyl group or two or more non-adjacent groups are independently —O—, —CO—, —CO—O—, —O—CO—Si (CH 3 ).
• R independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms
• R independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms
• —CH ⁇ CH—, —C ⁇ C—, —O—CO—O— and divalent May be substituted with one or more substituents selected from a ring structure
• One or more hydrogen atoms bonded to the group represented by the general formula (QX) are substituted with a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a carboxyl group, an amide group, a fluorine, a sulfide group, or a nitro group.
• a 21 , A 22 and A 23 are each independently (A) trans-1,4-cyclohexylene group (in this group, one methylene group or two or more methylene groups not adjacent to each other are replaced by —O—, —NH— or —S—) May be) (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4-cyclohexenylene.
• octylene group naphthalene-1,4-diyl group, naphthalene-2,6-diyl group, Represents a group selected from the group consisting of a decahydronaphthalene-2,6-diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the group (a), group (b) or Each group (c) may be unsubstituted or one or more hydrogen atoms may be replaced by fluorine, chlorine, cyano, alkyl or alkoxy groups, p, q and r each independently represent an integer of 0 to 4, and when p, q and r are 2 or more, a plurality of A 21 , A 22 , A 23 , Z 22 and Z 24 are May be the same or different, Z 21 , Z 22 , Z
• a 1 is, (A) trans-1,4-cyclohexylene group (in this group, one methylene group or two or more methylene groups not adjacent to each other are replaced by —O—, —NH— or —S—) May be) (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4-cyclohexenylene Group, 2,5-thiophenylene group, 2,5-furylene group, 1,4-bicyclo [2.2.2] octylene group, naphthalene-1,4-diyl
• R 1 and R 2 each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 50 carbon atoms, one —CH 2 — group in R 1 and R 2 , or two or more Non-adjacent —CH 2 — groups are —O—, —CO—, —CO—O—, —O—CO—, —CO—NH—, —NH—CO—, —NCH 3 —, —CH ⁇ CH.
• R 1 and R 2 may be substituted with one or more selected from the group consisting of —, —CF ⁇ CF— and —C ⁇ C—, It may be independently substituted with a cycloalkyl group having 3 to 8 ring members, and the hydrogen atom in R 1 and R 2 is substituted with an alkyl group having 1 to 20 carbon atoms, a cyano group or a halogen atom. Also good.
• a, b and c represent the molar fraction of the copolymer, and in each case 0 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 1, and 0 ⁇ c ⁇ 1;
• the sequence of the monomer units of Ma, Mb and Md may be the same as or different from the formula, and the monomer units of Ma, Mb and Md are each independently one type or two or more types of different units.
• the monomer units of Ma, Mb, and Md are each independently represented by the general formulas (U-1) to (U-13).
• membrane represented by this.
• the second aspect of the present invention is a polymer solution containing the polymer for photoalignment film of the first aspect and an organic solvent as essential components.
• the third aspect of the present invention is a photo-alignment film formed by the polymer for photo-alignment films of the first aspect.
• the fourth aspect of the present invention is an optical anisotropic body having the photo-alignment film of the third aspect.
• the fifth aspect of the present invention is a liquid crystal display element having the photo-alignment film of the third aspect.
• a photoalignment film having an excellent alignment regulating force can be formed. Since the photo-alignment film of the present invention has excellent liquid crystal alignment properties, it is possible to reduce AC image sticking of a liquid crystal display device having the same.
• the polymer for photoalignment films according to the first embodiment of the present invention is a polymer represented by the following general formula (X).
• R 11 is a group represented by the general formula (QX)
• a broken line represents a bond, and at least one group selected from the group consisting of a Saa single bond, an alkylene group having 1 to 3 carbon atoms, —O—, —COO—, and —O—CO—).
• Va represents at least one group selected from the group consisting of an alkyl group having 1 to 7 carbon atoms, an alkyl ether group, a naphthyl group and an anthryl group, wherein Saa is the alkylene group and Va Is the alkyl group, the total number of carbon atoms of Saa and Va is 7 or less,
• One of the —CH 2 — groups constituting the alkyl group or two or more non-adjacent groups are independently —O—, —CO—, —CO—O—, —O—CO—Si (CH 3 ).
• R independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms
• R independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms
• —CH ⁇ CH—, —C ⁇ C—, —O—CO—O— —
• divalent May be substituted with one or more substituents selected from a ring structure
• One or more hydrogen atoms bonded to the group represented by the general formula (QX) are substituted with a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a carboxyl group, an amide group, a fluorine, a sulfide group, or a nitro group. May be.
• a 21 , A 22 and A 23 are each independently (A) trans-1,4-cyclohexylene group (in this group, one methylene group or two or more methylene groups not adjacent to each other are replaced by —O—, —NH— or —S—) May be) (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4-cyclohexenylene.
• octylene group naphthalene-1,4-diyl group, naphthalene-2,6-diyl group, Represents a group selected from the group consisting of a decahydronaphthalene-2,6-diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the group (a), group (b) or Each group (c) may be unsubstituted or one or more hydrogen atoms may be replaced by fluorine, chlorine, cyano, alkyl or alkoxy groups, p, q and r each independently represent an integer of 0 to 4, and when p, q and r are 2 or more, a plurality of A 21 , A 22 , A 23 , Z 22 and Z 24 are May be the same or different,
• Z 21 , Z 22 , Z 23 and Z 24 are each independently a single bond, —O—, — (CH 2 ) u— (wherein u represents 1 to 20), —OCH 2 —CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 —, and —C ⁇ C—.
• L 1 is a single bond, — (CH 2 ) u— (wherein u represents 1 to 20), — OCH 2 —CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 — or —C ⁇ C
• one or more of non-adjacent CH 2 groups constituting L 1 are independently —O—, —CO—, —CO—O—, —O—CO—Si (CH 3 ) 2 — O—Si (CH 3 ) 2 —, —NR—, —NR—CO—, —CO—NR
• X and Y each independently represent a hydrogen atom or a halogen atom
• Z represents the general formula (IIa) or (IIb)
• R 1 and R 2 each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 50 carbon atoms, and R 1 and R 2 one in 2 -CH 2 - group or two or more non-adjacent -CH 2 - groups, -O -, - CO -, - CO-O -, - O-CO -, - CO-NH -, - May be substituted with one or more selected from the group consisting of NH—CO—, —NCH 3 —, —CH ⁇ CH—, —CF ⁇ CF— and —C ⁇ C—, and R 1 and R 2
• One or more of —CH 2 — groups may be independently substituted with a cycloalkyl group having 3 to 8 ring members, and the hydrogen atom in R 1 and R 2 may have 1 to 20 carbon atoms. Which may be substituted with an alkyl group, a cyano group or
• a, b and c represent the molar fraction of the copolymer, and in any case 0 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 1, and 0 ⁇ c ⁇ 1, and Ma, Mb and Md
• the order of the monomer units may be the same as or different from the formula, and the monomer units of Ma, Mb and Md may be independently one type or two or more different units, and Ma,
• the monomer units of Mb and Md are each independently represented by the general formulas (U-1) to (U-13)
• the polymer represented by the general formula (X) is a copolymer having a side chain unit MA bonded to the monomer unit Ma and a side chain unit MB bonded to the monomer unit Mb.
• the spacer group represented by Sp 1 represents a single bond, a linear or branched alkylene group having 1 to 40 carbon atoms, or the following general formula (IVa).
• One or more of adjacent —CH 2 — is independently —O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 —, —C ⁇ C—, —CO—, —S—, —Si (CH 3 ) 2 —O—Si (CH 3 ) 2 —, —NR′—, —NR′—CO— , —CO—NR′—, —NR′—CO—O—, —O—CO—NR′—, —NR′—CO—NR′—, —NR′—CO—NR′—, —CH ⁇ CH—, —C ⁇ C— or —O —CO—O— (wherein R ′ independently represents a
• One or more hydrogen atoms of —CH 2 — in the len group may be substituted with a fluorine atom, a chlorine atom, a hydroxy group, or a cyano group.
• a fluorine atom a chlorine atom
• a hydroxy group a cyano group
• a cyano group a group connected to Sp 1 and Sp 1 has a hetero atom
• the case where the hetero atom is connected is excluded.
• Sp 1 is preferably a structure represented by the alkylene group or the following general formula (IVa).
• the alkylene group has preferably 2 to 20 carbon atoms, more preferably 3 to 15 carbon atoms, and still more preferably 4 to 10 carbon atoms.
• Suitable spacer groups represented by Sp 1 include, for example, groups represented by the following general formula (IVa), among which chemical formulas (Sp-a-1) to (Sp-a-20), chemical formulas (Sp-b-1) to (Sp-b-14), chemical formula (Sp-c-1) to (Sp-c-14) and chemical formula (Sp-d-1) to (Sp-d-16)
• the spacer group represented is mentioned as a preferable group.
• the spacer group represented by Sp 1 in the general formula (X) may be the same as or different from the spacer group represented by Sp 2 described later.
• Z 21 and Z 22 are each independently a single bond, —O—, — (CH 2 ) u— (wherein u represents 1 to 20), —OCH 2 —. Consists of CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 —, and —C ⁇ C—. It represents at least one divalent linking group selected from the group. In the general formula (X), if Z 22 is plural, Z 22 may be the same as each other or may be different.
• p and q each independently represents an integer of 0 to 4.
• the plurality of A 21 may be the same or different from each other, and the plurality of Z 22 may be the same or different from each other.
• the plurality of A 22 may be the same as or different from each other.
• p is preferably 0 or 1
• q is preferably 0 or 1.
• a 21 and A 22 each independently represent (a) a trans-1,4-cyclohexylene group (one methylene group present in this group or 2 which are not adjacent to each other). Or more methylene groups may be replaced by —O—, —NH— or —S—). (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4-cyclohexenylene.
• octylene group naphthalene-1,4-diyl group, naphthalene-2,6-diyl group, Represents a group selected from the group consisting of a decahydronaphthalene-2,6-diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the group (a), group (b) or Each group (c) may be unsubstituted or one or more hydrogen atoms may be substituted by fluorine, chlorine, cyano, alkyl or alkoxy groups.
• a 21 and A 22 have multiple respective plurality of A 21 and A 22 may be the same as each other or may be different.
• R 11 is a group represented by the general formula (QX).
• the group represented by the general formula (QX) is preferably the following group.
• Va is an alkyl group having 1 to 7 carbon atoms
• Saa is preferably a single bond.
• the alkyl group is preferably linear or branched, and more preferably linear.
• Va is an alkyl group having 8 or more carbon atoms, the increase in AC image sticking becomes significant.
• examples of the alkyl ether group include methyl ether, ethyl ether, and linear or branched propyl ether, butyl ether, pentyl ether, hexyl ether, oxyl ether, And heptyl ether.
• the general formula (QX) when Va is a naphthyl group or an anthryl group, Saa is preferably an alkyl group having 1 to 3 carbon atoms, and Saa is an alkyl group having 1 or 2 carbon atoms. More preferred.
• the carbon atom at the 1-position of the naphthyl group is preferably bonded to Saa.
• Va when Va is an anthryl group (anthracenyl group), the 1st or 9th carbon atom of the anthryl group is preferably bonded to Saa, and the 9th carbon atom of the anthryl group is More preferably, it binds to Saa.
• Va is a naphthyl group or an anthryl group
• the reduction of AC image sticking becomes remarkable. Details of this reason are unclear, but since the distance from the diazenyl group to the end of the side chain is moderate, the main chain and side chain of the polymer constituting the peripheral photo-alignment film on the surface and bulk of the photo-alignment film It is surmised that the molecular volume of Va is not so small that the binding from is not large and the improvement of uniaxial orientation on the film surface is reduced.
• One of the —CH 2 — groups constituting the alkyl group or two or more non-adjacent groups are independently —O—, —CO—, —CO—O—, —O—CO—Si (CH 3 ). 2 —O—Si (CH 3 ) 2 —, —NR—, —NR—CO—, —CO—NR—, —NR—CO—O—, —O—CO—NR—, —NR—CO—NR — (Wherein R independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms), —CH ⁇ CH—, —C ⁇ C—, —O—CO—O—, —CH ⁇ CH It may be substituted with one or more substituents selected from —CO—O— and a divalent ring structure.
• One or more hydrogen atoms bonded to the group represented by the general formula (QX) are substituted with a fluorine atom, a chlorine atom, a cyano group, a hydroxyl group, a carboxyl group, an amide group, a fluorine, a sulfide group, or a nitro group. May be.
• divalent ring structure examples include an aromatic cyclic group, a heterocyclic group, and a cyclic alkyl group.
• the ring structure When the divalent ring structure substitutes the —CH 2 — group of the alkyl group, the ring structure preferably substitutes the terminal —CH 2 — group of the alkyl group. That is, the divalent ring structure is preferably a monovalent ring structure that replaces the terminal methyl group of the alkyl group.
• divalent ring structure and the monovalent ring structure include a divalent or monovalent ring structure in which any two or one hydrogen atoms constituting benzene, naphthalene, and anthracene are removed and two or one bond is present. It is preferably a monovalent ring structure.
• the group connected to Sp 2 and Sp 2 has a hetero atom, the case where the hetero atom is connected is excluded.
• Z 23 is a single bond, Sp 2 is preferably the a structure represented by an alkylene group or the following general formula (IVa).
• the left broken line represents a bond to Mb
• the right broken line represents a bond to Z 23
• Z 1 , Z 2 and Z 3 are each independently a single bond, — (CH 2 ) u- (wherein u represents 1 to 20), —OCH 2 —CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 Represents O—, —OCF 2 —, —CF 2 CF 2 — or —C ⁇ C—, but in Z 1 , Z 2 and Z 3 , one —CH 2 — group or two or more non-adjacent groups are independent.
• a 1 and A 2 are each independently, (A) trans-1,4-cyclohexylene group (in this group, one methylene group or two or more methylene groups not adjacent to each other are replaced by —O—, —NH— or —S—) May be) (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4
• octylene group naphthalene-1,4-diyl group, naphthalene-2,6-diyl group, Represents a group selected from the group consisting of a decahydronaphthalene-2,6-diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the group (a), group (b) or Each of the groups (c) may be unsubstituted or one or more hydrogen atoms may be substituted with a fluorine atom, a chlorine atom, a cyano group, a methyl group or a methoxy group, and p1 and q1 are each independently 0 or 1 is represented. ) It is represented by
• each group in the general formula (IVa) is preferably the following group.
• Z 1 , Z 2 and Z 3 are each independently a single bond, — (CH 2 ) u— (wherein u represents 1 to 20, and —CH 2 — Two or more of one or non-adjacent CH 2 groups are independently substituted with —O—, —CO—O—, —O—CO—, —CH ⁇ CH— or —C ⁇ C—. Or —OCH 2 —CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, or —C ⁇ C— is preferable.
• q1 is preferably 1.
• p1 is preferably 0.
• a 1 and A 2 are each independently any group of a trans-1,4-cyclohexylene group, a 2,6-naphthylene group, or a 1,4-phenylene group. Is preferred.
• the hydrogen atoms of these groups may be unsubstituted or one or more hydrogen atoms may be substituted with a fluorine atom, a methyl group or a methoxy group.
• Sp 2 represented by the general formula (IVa) for example, those represented by the following chemical formulas (Sp-a-1) to (Sp-ah1-8) are preferable.
• the left dashed line represents a bond to a monomer unit Mb
• right dashed line represents a bond to Z 23. You can select as needed.
• Z 23 and Z 24 are each independently a single bond, —O—, — (CH 2 ) u— (wherein u represents 1 to 20), —OCH 2 —. Consists of CH 2 O—, —COO—, —OCO—, —CH ⁇ CH—, —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 —, and —C ⁇ C—. It represents at least one divalent linking group selected from the group. In the general formula (X), if Z 24 is plural, Z 24 may be the same as each other or may be different.
• r represents an integer of 0 to 4. r is preferably 0 or 1. When r is 2 or more, the plurality of A 23 may be the same or different from each other, and the plurality of Z 24 may be the same or different from each other.
• a 23 represents (a) a trans-1,4-cyclohexylene group (one methylene group present in this group or two or more methylene groups not adjacent to each other is —O -, -NH- or -S- may be substituted). (B) 1,4-phenylene group (one or more of —CH ⁇ present in this group may be replaced by —N ⁇ ), and (c) 1,4-cyclohexenylene.
• octylene group naphthalene-1,4-diyl group, naphthalene-2,6-diyl group, Represents a group selected from the group consisting of a decahydronaphthalene-2,6-diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, the group (a), group (b) or Each group (c) may be unsubstituted or one or more hydrogen atoms may be substituted by fluorine, chlorine, cyano, alkyl or alkoxy groups.
• a 23 is preferably the group (b).
• a 23 may be the same as each other or may be different.
• D 1 and D 2 are the conditions under which D 1 is — (L 1 -A 1 ) kC ( ⁇ O) — and D 2 is a single bond, or D 2 Is —C ( ⁇ O) — (A 1 -L 1 ) f— and D 1 is a single bond.
• L 1 is a single bond, — (CH 2 ) u— (wherein u represents 1 to 20), —OCH 2 —CH 2 O—, —COO—, —OCO—, —CH ⁇ CH— , —CF ⁇ CF—, —CF 2 O—, —OCF 2 —, —CF 2 CF 2 — or —C ⁇ C—, wherein one or more of the non-adjacent CH 2 groups constituting L 1 are independent —O—, —CO—, —CO—O—, —O—CO—Si (CH 3 ) 2 —O—Si (CH 3 ) 2 —, —NR—, —NR—CO—, — CO—NR—, —NR—CO—O—, —O—CO—NR—, —NR—CO—NR—, —CH ⁇ CH—, —C ⁇ C— or —O—CO—O— (formula In the formula, R independently represents hydrogen or an alkyl group having
• a 1 constituting D 1 and D 2 is each independently any of a trans-1,4-cyclohexylene group, a 2,6-naphthylene group, or a 1,4-phenylene group.
• the hydrogen atoms of these groups may be unsubstituted or one or more hydrogen atoms may be substituted with a fluorine atom, a methyl group or a methoxy group.
• k and f are integers of 0 to 3, preferably 0 or 1. If k or f is 2 or 3, or different may be a plurality of L1 is the same as each other which constitutes the D 1 and D 2, a plurality of A 1 constituting the D 1 and D 2 may be the same as each other May be different.
• X and Y each independently represent a hydrogen atom or a halogen atom, preferably a hydrogen atom.
• Z represents general formula (IIa) or (IIb).
• R 1 and R 2 each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 50 carbon atoms, and R 1 and R 2 1 in two -CH 2 - group or two or more non-adjacent -CH 2 - groups, -O -, - CO -, - CO-O -, - O-CO -, - CO-NH-, R 1 and R 2 may be substituted with one or more selected from the group consisting of —NH—CO—, —NCH 3 —, —CH ⁇ CH—, —CF ⁇ CF— and —C ⁇ C—.
• One or two or more —CH 2 groups therein may be independently substituted with a cycloalkyl group having 3 to 8 ring members, and the hydrogen atoms in R 1 and R 2 may have 1 to 20 carbon atoms. May be substituted with an alkyl group, a cyano group or a halogen atom.
• R 1 is a linear or branched alkyl group having 1 to 30 carbon atoms (one —CH 2 — group in the alkyl group or two or more non-adjacent groups—
• the CH 2 — group may be substituted with —O—, —CO—, —CO—O—, —O—CO—, —CO—NH—, —NH—CO—, —NCH 3 —
• One or more —CH 2 — groups in the alkyl group may each independently be substituted with a cycloalkyl group having 3 to 8 ring members, and the hydrogen atom in the alkyl group has 1 to R 2 represents a linear or branched alkyl group having 1 to 30 carbon atoms (one of the above alkyl groups or one or more of them may be substituted with 20 alkyl groups, a cyano group or a halogen atom).
• alkyl group may be substituted, and the hydrogen atom in the alkyl group may be unsubstituted or substituted with an alkyl group having 1 to 20 carbon atoms, a cyano group, or a halogen atom. It is preferable.
• ⁇ Monomer unit> In the general formula (X), the arrangement of the monomer units of Ma, Mb, and Md may be the same as or different from those of the formula, and the monomer units of Ma, Mb, and Md are each independently one type or two. More than one kind of different units may be used, and each monomer unit of Ma, Mb and Md independently represents any one type of repeating unit of the general formulas (U-1) to (U-13). .
• Any hydrogen atom in 1) to (U-13) may be substituted by a fluorine atom, a chlorine atom, a methyl group, a phenyl group, or a methoxy group;
• R 1a is a tetravalent ring structure, and
• R 2a is Trivalent organic group,
• R 3a represents a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 15 carbon atoms, or an alkoxy group having 1 to 15 carbon atoms.
• Suitable monomer units of Ma, Mb and Md are monomer units represented by the general formula (U-1).
• R a is preferably independently a hydrogen atom or a methyl group, and one or more hydrogen atoms bonded to the methyl group are substituted with a fluorine atom. May be.
• Examples of the tetravalent ring structure represented by R 1a include a cyclic group having four bonds in which four hydrogen atoms bonded to an aromatic ring, a heterocyclic ring, and an aliphatic ring are removed. Cycloalkanes such as cyclobutane, cyclopentane and cyclohexane are preferred.
• Examples of the trivalent ring structure represented by R 2a include a cyclic group having three bonds by removing three hydrogen atoms bonded to an aromatic ring, a heterocyclic ring, and an aliphatic ring. A group in which three hydrogen atoms are removed from a benzene ring is preferred.
• the broken line in the formula represents a bond to Sp 1 .
• dashed line in the formula represents a bond to Sp 2.
• the broken line in the formula represents a bond to a hydrogen atom or a monovalent organic group.
• group represented by the said general formula (QX) is mentioned, for example.
• the polymer for photoalignment films represented by the general formula (X) has a side chain unit MA bonded to the monomer unit Ma and a side chain unit MB bonded to the monomer unit Mb.
• the side chain unit MA is preferably photochemically isomerizable and not photochemically crosslinked.
• the side chain unit MB is preferably photochemically crosslinkable.
• the polymer for a photoalignment film may include a side chain unit MD bonded to the monomer unit Md.
• a, b and c represent the molar fraction of the copolymer, and in any case, 0 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 1, and 0 ⁇ c ⁇ 1 .
• the ratio represented by a / (a + b + c) ⁇ 100% is preferably 0.1 to 30%, more preferably 1 to 15%, still more preferably 2 to 10%. Within the preferable range, AC image sticking can be further reduced.
• the method for synthesizing the photoalignment polymer of the present invention is not particularly limited, and for example, the method described in Patent Document 1 can be applied.
• a known polymerization initiator can be used in accordance with the polymerization mode of the polymerization functional group.
• the polymerization initiator for example, known polymerization initiators described in polymer synthesis and reaction (edited by the Society of Polymer Science, Kyoritsu Shuppan) and the like can be applied.
• the addition amount of the polymerization initiator can be, for example, 0.1 to 10% by mass with respect to the total mass of the mixture including the monomer composition to be polymerized.
• the target polymer can also be synthesized by performing an addition reaction to the polymer main chain using a polysiloxane compound.
• the polymer for photo-alignment of the present invention can be obtained by conducting a polymerization reaction in a reaction vessel and further purifying it.
• the solvent in the polymerization reaction include benzene, toluene, xylene, ethylbenzene, pentane, hexane, heptane, octane, cyclohexane, cycloheptane, methanol, ethanol, 1-propanol, 2-propanol, ethylene glycol, ethylene glycol monomethyl ether, Examples include ethylene glycol dimethyl ether, 2-butanone, acetone, tetrahydrofuran, ⁇ -butyrolactone, N-methyl-pyrrolidone, dimethyl sulfoxide, dimethylformamide, and the like.
• the solvent used for the polymerization reaction may be one type or a combination of two or more types.
• the polymer for photoalignment of the present invention may also be obtained by a method in which a composition containing each monomer is applied on a substrate and the solvent is dried and removed as necessary, followed by a polymerization reaction by heating or light irradiation. it can.
• the polymer for photoalignment of the present invention is obtained by applying a polymer solution containing the photoalignment polymer and an organic solvent as essential components onto a substrate, drying and removing the organic solvent, and then performing a polymerization reaction by heating or light irradiation. It can also be obtained by the method of performing.
• the organic solvent that can be used here is not particularly limited.
• the polymer solution preferably has a solid content in the range of 0.5 to 20% by mass, particularly 1 to 10% by mass from the viewpoint of coating properties.
• a photo-alignment film having an alignment regulating force By irradiating the film made of the polymer of the present invention with polarized ultraviolet rays, a photo-alignment film having an alignment regulating force can be obtained.
• a method for obtaining a film made of the polymer for example, it can be obtained by applying a solution of the polymer to a substrate and drying it.
• the photo-alignment film (liquid crystal alignment layer) of the present invention can be applied to a horizontal alignment or vertical alignment mode liquid crystal display element.
• the material for the substrate examples include glass, silicon, polyethylene terephthalate, polybutylene terephthalate, polyethersulfone, polycarbonate, and triacetyl cellulose.
• These substrates may be provided with an electrode layer such as an ITO film made of Cr, Al, In 2 O 3 —SnO 2 , or a NESA film made of SnO 2 .
• an electrode layer such as an ITO film made of Cr, Al, In 2 O 3 —SnO 2 , or a NESA film made of SnO 2 .
• a photo-etching method or a method using a mask when forming the electrode layers is used.
• a color filter layer or the like may be formed on the substrate.
• Examples of the method for applying the polymer-containing solution on the substrate include spin coating, die coating, gravure coating, flexographic printing, and inkjet printing.
• the solid content concentration of the solution during application is preferably 0.5 to 10% by weight. It is more preferable to select from this range in consideration of the method of applying the solution on the substrate, viscosity, volatility and the like.
• After applying the polymer solution on the substrate it is preferable to heat the coated surface to remove the solvent.
• the heating temperature is, for example, preferably 50 to 300 ° C., more preferably 80 to 200 ° C.
• the heating time in this suitable temperature range is, for example, preferably 2 to 200 minutes, and more preferably 2 to 100 minutes.
• Side chain unit MA photoisomerization reaction and side chain unit MB are applied to the coating film formed on the substrate by irradiation with linearly polarized light from the normal direction of the coating film surface and / or irradiation with non-polarized light or linearly polarized light from the oblique direction.
• This photocrosslinking reaction By causing this photocrosslinking reaction, a photo-alignment film imparted with alignment control ability can be obtained.
• linearly polarized light irradiation from an oblique direction is preferable.
• the irradiation from the oblique direction refers to a case where the angle formed between the light irradiation direction and the substrate surface is not less than 1 degree and not more than 89 degrees.
• the pretilt angle is preferably 70 to 89.8 °.
• the pretilt angle is 0 to 20 °.
• ultraviolet rays and visible rays including light having a wavelength of 150 nm to 800 nm can be used, and ultraviolet rays of 270 nm to 450 nm are particularly preferable.
• the light source include a xenon lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, and a metal halide lamp.
• Linearly polarized light can be obtained by using a polarizing filter or a polarizing prism for the light from these light sources.
• the wavelength range of the ultraviolet light and visible light obtained from such a light source may be limited using an interference filter or a color filter.
• the film thickness of the formed photo-alignment film is preferably about 10 to 250 nm, more preferably about 10 to 100 nm.
• a liquid crystal cell in which a liquid crystal composition is sandwiched between a pair of substrates and a liquid crystal display device using the same can be manufactured as follows.
• a liquid crystal cell can be manufactured by preparing two substrates on which the photo-alignment film in the present invention is formed and disposing a liquid crystal between the two substrates.
• the photo-alignment film may be formed on only one of the two substrates.
• the following method is mentioned, for example.
• a liquid crystal cell can be manufactured by injecting and filling the liquid crystal composition into the cell gap defined by the substrate surface and the sealing agent, and then sealing the injection hole.
• the liquid crystal cell can also be manufactured by a technique called an ODF (One Drop Fill) method.
• ODF One Drop Fill
• an ultraviolet light curable sealant is applied to a predetermined place on the substrate on which the photo-alignment film is formed, and a liquid crystal composition is further dropped on the photo-alignment film, and then the photo-alignment film The other substrate is bonded so that the two face each other.
• the liquid crystal cell can be manufactured by irradiating the entire surface of the substrate with ultraviolet light to cure the sealing agent.
• the liquid crystal photo-alignment film used here is preferably heated to a temperature at which it takes an isotropic phase, and then slowly cooled to room temperature, thereby removing the flow alignment generated at the time of injection.
• the liquid crystal composition is not particularly limited, and for example, a known nematic liquid crystal composition can be used.
• a vertical alignment type liquid crystal cell those having negative dielectric anisotropy are preferable.
• a horizontal alignment type liquid crystal cell those having positive dielectric anisotropy are preferred.
• a liquid crystal display element can be obtained by bonding a known polarizing plate to the outer surface of the liquid crystal cell.
• the optical anisotropic body of the present invention has the photo-alignment film of the present invention.
• the optical anisotropic body of the present invention may have the photo-alignment film of the present invention and a film made of a polymer of a polymerizable liquid crystal composition formed on the photo-alignment film.
• This optical anisotropic body is useful for applications such as an optical anisotropic film used for optical compensation of a liquid crystal display element.
• optical properties such as light propagation speed, refractive index, and absorption differ depending on the traveling direction.
• a photo-alignment film is formed on a substrate, a polymerizable liquid crystal composition is applied thereon, and the liquid crystal molecules aligned by the photo-alignment film are included.
• a method of forming a polymer film may be mentioned.
• an optical anisotropic body is produced by applying a polymerizable liquid crystal composition on a photo-alignment film
• a known coating method can be applied.
• a known organic solvent may be added to the polymerizable liquid crystal composition.
• the organic solvent is removed by a known drying method.
• Examples of the method of polymerizing the polymerizable liquid crystal composition include a method of irradiating the polymerizable liquid crystal composition with active energy rays, a thermal polymerization method, and the like.
• the polymerizable liquid crystal composition is polymerized by irradiation with active energy rays
• a method of irradiating ultraviolet rays at an irradiation intensity of 1 W / m 2 to 10 kW / m 2 can be mentioned.
• the temperature at which the polymerizable liquid crystal composition is polymerized by heat is preferably a temperature at which the polymerizable liquid crystal composition exhibits a liquid crystal phase or lower.
• the specific heating temperature is, for example, preferably 20 ° C. to 300 ° C., more preferably 30 ° C. to 200 ° C., and further preferably 30 ° C. to 120 ° C.
• a polymeric group is a (meth) acryloyloxy group
• the temperature is suitable, heterogeneous polymerization due to heat can be prevented.
• a polymerization method of the polymerizable liquid crystal composition either one or both of photopolymerization and thermal polymerization can be employed.
• the optical axis of the optical anisotropic body of the present invention can be adjusted by controlling the pretilt angle by the photo-alignment film.
• the pretilt angle is preferably from 0 degrees to 45 degrees.
• the pretilt angle is preferably 45 degrees to 90 degrees.
• the following method is exemplified.
• a coating film of the polymer is formed on a substrate.
• the light which has anisotropy is irradiated, an orientation control ability is provided to the said coating film, and a photo-alignment film is formed.
• a polymerizable liquid crystal composition film is formed on the photo-alignment film.
• the film of the polymerizable liquid crystal composition is polymerized to form an optical anisotropic body.
• an isomerization reaction or a crosslinking reaction may proceed simultaneously in the photo-alignment film.
• the polymer coating film is directly irradiated with light, it is possible to obtain a photo-alignment film excellent in the alignment regulating force of liquid crystal molecules.
• a coating film of the polymer is formed on the substrate.
• a film of a polymerizable liquid crystal composition is formed on the coating film.
• light having anisotropy is irradiated to impart a liquid crystal alignment control force to the polymer coating film to form a photo-alignment film.
• the film of the polymerizable liquid crystal composition is polymerized to form an optical anisotropic body.
• the third step and the fourth step may be performed simultaneously by light irradiation or the like. The number of processes can be reduced by simultaneous progress.
• a plurality of layers made of optical anisotropic bodies may be stacked.
• a method of forming a laminated body of optical anisotropic bodies a method of repeating a method of forming a single layer a plurality of times can be mentioned. For example, a first layer of an optical anisotropic body is formed on the photo-alignment film, a new photo-alignment film is formed on the first layer, and a second layer of the optical anisotropic body is formed on the photo-alignment film. And a method of directly forming the second layer of the optical anisotropic body on the first layer of the optical anisotropic body formed on the photo-alignment film.
• Examples of the use of an optical anisotropic laminate having a plurality of optical anisotropic layers include simultaneous use of optical compensation of a liquid crystal layer and a polarizing plate of a liquid crystal display element, and optical compensation of a liquid crystal layer of a liquid crystal display element. And the use of simultaneously improving the brightness, the use of simultaneously improving the optical compensation of the polarizing plate of the liquid crystal display element and the brightness, and the like.
• the optical anisotropic body can be heat-aged.
• the polymerizable liquid crystal composition used for the production of the optical anisotropic body is not particularly limited, and a known liquid crystal composition containing a polymerizable liquid crystal exhibiting liquid crystallinity alone or in a composition with another liquid crystal compound can be applied. is there. *
• optical anisotropic body obtained by the above steps may be used alone as an optical anisotropic body by peeling the optical anisotropic layer from the substrate, or without being peeled from the substrate. It can also be used as a cuboid.
• the optical axis means that the refractive index is constant in a liquid crystal display element or optical anisotropic body, and birefringence does not occur even when unpolarized light is incident, and ordinary light and extraordinary light coincide. Or the direction in which the deviation is minimized.
• the orientation is the direction when the liquid crystal molecules in the liquid crystal cell of the liquid crystal display element or the polymerizable liquid crystal molecules forming the optical anisotropic body are oriented in a certain direction, In the case of rod-like liquid crystal molecules, the direction taken by the molecular long axis is assumed, and in the case of disc-like liquid crystal molecules, the direction is normal to the disc surface.
• the pretilt angle is an angle formed between the alignment direction of liquid crystal molecules or polymerizable liquid crystal molecules and the substrate surface.
• the polymerizable liquid crystal is a compound that exhibits a liquid crystal phase and includes a polymerizable chemical structure.
• the homogeneous alignment is an alignment having a pretilt angle of 0 degree or more and 20 degrees or less.
• the homeotropic alignment is an alignment having a pretilt angle of 70 degrees or more and 90 degrees or less. The angle formed by the optical axis with respect to the substrate surface and the pretilt angle may or may not match.
• Bromopropane was slowly added dropwise thereto, and the mixture was stirred at 40 ° C. for 1 hour. After returning to room temperature, zinc chloride and 1,1′-bis (diphenylphosphino) ferrocene-palladium (II) dichloride were added. After stirring at room temperature for 1 hour, a compound represented by the following formula (6-3) was slowly added and reacted to obtain a compound represented by the following formula (6-4).
• a compound represented by the following formula (6-4) is suspended in an aqueous hydrochloric acid solution in a reaction vessel equipped with a thermometer and a stirrer, and reacted with sodium nitrite while cooling with ice. By reacting with sodium, a compound represented by the following formula (6-5) was obtained.
• Bromoheptane was slowly added dropwise thereto, and the mixture was stirred at 40 ° C. for 1 hour. After returning to room temperature, zinc chloride and 1,1′-bis (diphenylphosphino) ferrocene-palladium (II) dichloride were added. After stirring at room temperature for 1 hour, a compound represented by the following formula (7-3) was slowly added and reacted to obtain a compound represented by the following formula (7-4).
• a compound represented by the following formula (7-4) is suspended in an aqueous hydrochloric acid solution in a reaction vessel equipped with a thermometer and a stirrer, and reacted with sodium nitrite while cooling with ice.
• ⁇ Synthesis of methacrylate monomer (a-1)> Mix 34 g of 10-bromo-1-decanol, 22 g of methacrylic acid, 70 mg of 4-methoxyphenol, 2 g of p-toluenesulfonic acid monohydrate, 200 mL of cyclohexane and 40 mL of diisopropyl ether, and heat in an oil bath. Refluxed for 8 hours. After allowing the reaction solution to cool to 30 ° C., 100 mL of water was added to the reaction solution to extract the organic layer.
• the organic layer was washed twice with 100 mL of 5% aqueous sodium hydrogen carbonate solution and once with 100 mL of saturated brine. The organic layer after washing was concentrated under reduced pressure to obtain 50 g of a compound represented by the following formula (a-1-1) as a colorless liquid.
• a reaction vessel 23 g of p-hydroxybenzaldehyde, 46 g of potassium carbonate, and 46 g of compound (a-1-1) were suspended in 300 mL of DMF and stirred at 90 ° C. for 6 hours to complete the reaction. After cooling the reaction solution to 10 ° C., 650 mL of water was added dropwise to the reaction solution to precipitate a solid.
• the solid was collected by filtration to obtain 72 g of a compound represented by the following formula (a-1-2) as a brown granular solid.
• a reaction vessel 66 g of a compound represented by the following formula (a-1-2) was dissolved in 980 mL of methanol, and an aqueous sodium dihydrogen phosphate solution (19 g of sodium dihydrogen phosphate dihydrate was added to 250 mL of water. Dissolved solution) and 32 mL of 30% aqueous hydrogen peroxide were sequentially added.
• a sodium chlorite aqueous solution (a solution in which 27 g of sodium chlorite having a purity of 80% was dissolved in 220 mL of water) was added dropwise.
• reaction solution was stirred at 45 ° C. for 3 hours to complete the reaction.
• reaction solution is slowly cooled to 20 ° C., water is added dropwise to the reaction solution to precipitate a solid.
• the solid was collected by filtration, and the solid was washed with water by shaking.
• the crude product of colorless scaly crystals thus obtained was dried under reduced pressure for 8 hours to obtain 47 g of compound (a-1-3) as colorless crystals.
• 54 g of 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride and 0.3 g of 4-dimethylaminopyridine were dissolved in 406 mL of 2-cyanoethanol.
• the reaction mixture was redissolved in THF (60 mL in this synthesis example) of 3 times the amount of monomer used (3 mL per 1 g of monomer), and 5 times the amount of monomer used (single amount) 5 mL of hexane (100 mL in this synthesis example) was added to precipitate the reaction mixture, and the supernatant was removed by decantation. After further redissolution in THF, precipitation with hexane, and decantation, the reaction mixture obtained was dried under reduced pressure at 20 ° C. and 0.13 kPa for 24 hours under light shielding. A copolymer (P1) represented by (P1) was obtained.
• the molecular weight of the obtained copolymer was determined by gel permeation chromatography (GPC) measurement under the conditions described later, it was a polystyrene standard and had a weight average molecular weight (Mw) of 184081 and a dispersion ratio (Mw / Mn) of 2.13.
• GPC gel permeation chromatography
• the reaction mixture was redissolved in THF (60 mL in this synthesis example) of 3 times the amount of monomer used (3 mL per 1 g of monomer), and 5 times the amount of monomer used (single amount) 5 mL of hexane (100 mL in this synthesis example) was added to precipitate the reaction mixture, and the supernatant was removed by decantation. After further redissolution in THF, precipitation with hexane, and decantation, the reaction mixture obtained was dried under reduced pressure at 20 ° C. and 0.13 kPa for 24 hours under light shielding. A copolymer (P2) represented by (P2) was obtained.
• the molecular weight of the obtained copolymer was determined by gel permeation chromatography (GPC) measurement under the above conditions, it was a polystyrene standard and had a weight average molecular weight (Mw) of 247197 and a dispersion ratio (Mw / Mn) of 2.16.
• the reaction mixture was redissolved in THF (60 mL in this synthesis example) of 3 times the amount of monomer used (3 mL per 1 g of monomer), and 5 times the amount of monomer used (single amount) 5 mL of hexane (100 mL in this synthesis example) was added to precipitate the reaction mixture, and the supernatant was removed by decantation. After further redissolution in THF, precipitation with hexane, and decantation, the reaction mixture obtained was dried under reduced pressure at 20 ° C. and 0.13 kPa for 24 hours under light shielding. A copolymer (P3) represented by (P3) was obtained.
• the molecular weight of the obtained copolymer was determined by gel permeation chromatography (GPC) measurement under the above-mentioned conditions.
• the polystyrene standard had a weight average molecular weight (Mw) of 367821 and a dispersion ratio (Mw / Mn) of 2.16.
• the polystyrene standard had a weight average molecular weight (Mw) of 210,424, a dispersion ratio (Mw / Mn) of 2.09, and the residual monomer amount was 0.16%.
• ⁇ Synthesis Example 14> Stir at 60 ° C. for 2 hours using 1.5 g of the monomer (a-1) obtained in Synthesis Example 8, 0.08 g of the monomer (m4) obtained in Synthesis Example 4, 11 mg of AIBN and 5 mL of THF. Except that, 0.25 g of a copolymer (P6) represented by the following formula (P6) was obtained in the same manner as in Synthesis Example 9.
• the polystyrene standard had a weight average molecular weight (Mw) of 258,505 and a dispersion ratio (Mw / Mn) of 1.92.
• the reaction mixture was redissolved in THF (60 mL in this synthesis example) of 3 times the amount of monomer used (3 mL per 1 g of monomer), and 5 times the amount of monomer used (single amount) 5 mL of hexane (100 mL in this synthesis example) was added to precipitate the reaction mixture, and the supernatant was removed by decantation. After further redissolving in THF, precipitation with hexane, and decantation three times, the reaction mixture obtained was dried under reduced pressure at 20 ° C. and 0.13 kPa for 24 hours under light shielding, followed by 9.2 g of the following formula A copolymer (P8) represented by (P8) was obtained.
• the molecular weight of the obtained copolymer was measured by GPC, it was a weight average molecular weight (Mw) of 263425 and a dispersion ratio (Mw / Mn) of 2.23 based on polystyrene.
• a copolymer (P10) represented by the following formula (P10) was obtained in the same manner as in Synthesis Example 10 except that the monomer (m7) obtained in Synthesis Example 7 was used.
• Mw weight average molecular weight
• Mn dispersion ratio
• a copolymer (Ref-P2) represented by the following formula (Ref-P2) was obtained in the same manner as in Synthesis Example 10 using the compound represented by the above formula (m9).
• Bromooctane was slowly dropped into the solution, and then stirred at 40 ° C. for 1 hour. After returning to room temperature, zinc chloride and 1,1′-bis (diphenylphosphino) ferrocene-palladium (II) dichloride were added. After stirring at room temperature for 1 hour, a compound represented by the following formula (22-3) was slowly added and reacted to obtain a compound represented by the following formula (22-4).
• a compound represented by the following formula (22-4) is suspended in a hydrochloric acid aqueous solution in a reaction vessel equipped with a thermometer and a stirrer, and reacted with sodium nitrite while cooling with ice, then phenol, sodium hydroxide To obtain a compound represented by the following formula (22-5).
• a compound represented by the following formula (22-5) potassium carbonate, DMF, and a compound represented by the following formula (6) to a reaction vessel equipped with a thermometer and a stirrer, the following formula is obtained.
• the compound represented by (m11) was obtained.
• a copolymer (Ref-P4) represented by the following formula (Ref-P4) was obtained in the same manner as in Synthesis Example 10 using the compound represented by the above formula (m11).
• a copolymer (Ref-P5) represented by the following formula (Ref-P5) was obtained in the same manner as in Synthesis Example 10 using the compound represented by the above formula (m12).
• NMP N-methyl-2-pyrrolidone
• a conducting wire was attached to the obtained liquid crystal cell and heated at 92 ° C. for 2 minutes. Thereafter, a VT curve on each electrode was obtained using LCD5200 manufactured by Otsuka Electronics Co., Ltd. Thereafter, a stress of 10 V was applied to the electrode in a thermostatic chamber manufactured by ESPEC Co., Ltd. at 60 ° C., 60 Hz, 64 hours. After application, a VT curve was obtained again using the LCD5200, and the ratio of the light transmittance on each electrode at 4 V before and after stress application was calculated. That is, a value (T1 / T2) obtained by dividing the transmittance T1 before application by the transmittance T2 after application was defined as an evaluation parameter for AC image sticking. In an ideal state where there is no AC image sticking, the evaluation parameter is 1, and the evaluation parameter becomes larger than 1 when the ideal state is left. The AC image sticking of the liquid crystal cell using the copolymer (p1) was 1.10.
• Nematic liquid crystal mixed PA0500 manufactured by DIC Corporation is prepared by blending the liquid crystal compounds shown in Table 1 in the blending amounts shown in the same table.
• the nematic-isotropic liquid phase transition temperature (clearing point) was 85.6 ° C.
• the extraordinary refractive index n e at a wavelength of 589nm is 1.596
• the ordinary refractive index n o at a wavelength of 589nm was 1.491.
• the dielectric anisotropy was +7.0
• K 22 (twist elastic modulus) was 7.4 pN.
• Example 11 5 parts of copolymer (p1) was dissolved in a mixed solvent of 47.5 parts of N-methyl-2-pyrrolidone and 47.5 parts of 2-butoxyethanol and stirred at room temperature for 10 minutes. Next, the solution was applied to each of two glass plates as a substrate using a spin coater. Here, of the two glass plates to be paired, one glass plate is formed with comb-shaped ITO electrodes having an electrode interval of 5 ⁇ m along the long side direction of the glass plate. Subsequently, the two glass plates coated with the above solution were heated at 80 ° C. for 3 minutes and further at 180 ° C.
• the copolymer (p1) was uniformly applied to form a smooth film.
• ultraviolet light (313 nm, illuminance 20 mW / cm 2 ) is irradiated as parallel light to the surface on which the coating film of the glass plate is formed through a wavelength cut filter, a band pass filter, and a polarizing filter from an ultra high pressure mercury lamp.
• a photo-alignment film photo-alignment layer
• the irradiated ultraviolet light is linearly polarized light, and ultraviolet light from the normal direction to the glass plate surface so that the vibration direction of the electric field of the linearly polarized light is parallel to the comb pattern ITO electrode (long side direction of the glass plate).
• Ultraviolet irradiation energy was 100 mJ / cm 2.
• a polymerizable liquid crystal composition (LC-1) in which the liquid crystal compounds shown in Table 3 were blended in the blending amounts shown in the same table was applied on the photo-alignment film obtained above with a spin coater, and the mixture was applied at 80 ° C. for 1 minute.
• the orientation was A, and good orientation could be obtained with a small dose of 100 mJ / cm 2 .
• the orientation direction was observed, the orientation was homogeneous. Further, it has been found that the optical anisotropic body of the present invention can impart orientation and control the orientation direction with an extremely small amount of ultraviolet irradiation during production.
• Example 12 to 20 An optical anisotropic body was obtained in the same manner as in Example 11 except that the copolymers (p2) to (P10) were used instead of the copolymer (p1). As a result of evaluating the obtained optical anisotropic body by the above method, the orientation was A, and when the orientation direction was observed, the orientation was homogeneous. Therefore, like Example 11, the optical anisotropic body which has the outstanding orientation with the small light irradiation amount of 100 mJ / cm ⁇ 2 > was able to be manufactured.
• the optical anisotropic bodies of the examples according to the present invention have excellent orientation. Moreover, when forming the photo-alignment film constituting the optical anisotropic body, it was found that the polymer of the example according to the present invention has high sensitivity to polarized ultraviolet rays because the irradiation amount of polarized ultraviolet rays was small. .
• the polymer for photo-alignment films according to the present invention is widely applicable in the field of liquid crystal displays.

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